mb/google/trulo/var/orisa: Disable storage devices based on fw_config

Disable devices in variant.c instead of adding probe statements to
devicetree because storage devices need to be enabled when fw_config is
unprovisioned.

BUG=b:345112878
BRANCH=firmware-nissa-15217.B
TEST=emerge-nissa coreboot chromeos-bootimage

Change-Id: I1e5e49c1baa8d2b00134c26cc3b69aa15712b512
Signed-off-by: Amanda Huang <amanda_hwang@compal.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82907
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-by: Eric Lai <ericllai@google.com>
diff --git a/src/mainboard/google/brya/variants/orisa/overridetree.cb b/src/mainboard/google/brya/variants/orisa/overridetree.cb
index 6427222..600eb02 100644
--- a/src/mainboard/google/brya/variants/orisa/overridetree.cb
+++ b/src/mainboard/google/brya/variants/orisa/overridetree.cb
@@ -3,6 +3,10 @@
 		option THERMAL_SOLUTION_6W 0
 		option THERMAL_SOLUTION_15W 1
 	end
+	field STORAGE 30 31
+		option STORAGE_EMMC		0
+		option STORAGE_UFS		1
+	end
 end
 
 chip soc/intel/alderlake